In order to better optimize the combustion characteristics of PODE-gasoline dual fuel

by changing the proportion of gasoline direct injection and the moment of gasoline direct injection

the combustion characteristics of PODE-gasoline dual fuel vehicles is simulated using software. The result shows that under large-load conditions

when the proportion of gasoline direct injection in the cylinder is 10% to 30%

the peak pressure of the cylinder is higher than that of the single airway injection

and the combustion performance index is improved; When the direct injection ratio is higher than 30%

the peak pressure of the cylinder is reduced and the combustion performance index is reduced; In the case of gasoline relatively late injection (−40° to −70°)

with the advance of the injection moment

the combustion start point is delayed

the peak cylinder pressure is reduced

the peak of the heat release rate is reduced; and the gasoline is relatively early injection (−80° to −110°)

with the advance of the injection moment

the combustion is in a bimodal state

the gasoline cylinder mixture is more layered

and a concentrated gasoline mixture is formed in the narrow area

which makes the combustion area wider and helps to reduce HC and CO emissions.